^4 PHILOSOPHICAL TRANSACTIONS. [aNNO 1770. 



6°. I have also subjoined the several particulars of my meteorological 

 observations, during my 5 months stay in Lapland. Suffice it to give you the mean 

 height of the barometer, which I found 'n in. 6.2 lin. Paris, in March; 27 in. 

 5.5 lin. in April; 27 in. T .^ lin. in May; and 27 in. 5.8 lin. in June; the mean 

 height for 4 months being 27 in. 6-1^ lin. I could not well measure exactly my 

 elevation above the level of the sea, but I take it not to exceed 40 or 50 toises. 



XXXII. Experiments on the Blood, with some Remarks on its Morbid Appear- 



ances. By TVilliam Hewson, F. R. S., p. 368. 

 Reprinted in the 1st vol., of this author's collected works. 



XXXIII. and XXXIV. On the Degree of Heat which Coagulates the Lymph, 

 and the Serum of the Blood; with an Enquiry into the Causes of the Inflam- 

 matory Crust, or Size, as it is called. By the same. p. 384, and p. 398. 



May be consulted in the vol. of Mr. Hewson's works before referred to. 



XXXV. Account of some Bones found in the Rock of Gibraltar, in a Letter 

 from John Boddington, Esq., to Dr. Wm. Hunter, F. R. S., with some Remarks 

 by Dr. Hunter, p. 414. 



I beg your acceptance of a piece of the rock of Gibraltar, which my friend 

 Colonel Green, chief engineer of that garrison, has brought from thence, and 

 given to me as a natural curiosity : it appears to be a very extraordinary one indeed : 

 therefore, I shall attempt to explain to you the manner of discovering it, and 

 leave the rest to your better judgment. You must know then. Sir, that Gibraltar 

 is always attended to with great circumspection. The city, town, and fortifica- 

 tion are all upon a rock, and sand; of which the whole peninsula is composed: 

 as nature changes the face of the rock, the engineers have a watchful eye to 

 apply art in forming the defences where nature fails; a particular instance of 

 which happened in the course of the present year, by the craggy part of the 

 rock falling away, so as to admit the probability of an entrance into the for- 

 tification; to obstruct which, a wall was erected 70 feet distant from the sea 

 shore, and 57 feet perpendicular above high water mark. In blowing up the 

 rock to make way for the foundation of the wall, there were discovered consider- 

 able quantities of petrified bones, as you may perceive on examining the piece 

 of rock, which you may be certain was taken from the spot by Colonel Green, 

 and has been in the possession of no person but himself. 



Dr. Hunter s answer. — By the examination of two pieces of the rock of 

 Gibraltar, which are in my possession, I find that they are not, what I at first, 

 took them to be, human bones, but those of some quadruped. I discovered 

 this, with my brother's assistance, by clearing the teeth of the crust that covered 



